The Cuplock Inside Board Transom is a unique system designed to provide a secure and stable platform for the construction of scaffolding structures. It consists of four horizontal tubes, each with a pair of internal cup locks that fit together to form a solid frame. The transom is typically used with a timber deck or steel platform and provides a strong and stable base for building scaffolding structures. It is easy to assemble and can be used for a variety of projects such as constructing bridges, buildings, and other tall structures.